I have two DCC engines, AT-A & GP-40 which I would like to lube,however, once the shells are off there is no easy access to the gear drives. I`ve been in model trains a long time and never seen where a field strip down had to be done in order to lubricate. Is this possible or is it that they do not need lube?
      Any advise?
                                              Thank you in advance, Happy New Year 

                    Thank you everyone for the help. Merry Christmas and a Happy New Year to all.

       Thanks, I appreciate the reply.

      I have recently purchased a digital commander set.Included were a Sante Fe FT-A and a Sante Fe GP40.I would like to remove the shells to lubricate the two units,however, Bachmann , does not give instructions on how to remove shells.Help would be appreciated, don`t want damage anything.Thanks.